Surgical stapling instrument



FIG. 1 is a top plan view of a surgical stapling instrument showing our new design;

FIG. 2 is a side elevation thereof;

FIG. 3 is a fragmentary perspective view of the front portion of the instrument; and

FIG. 4 is a fragmentary perspective view of the rear portion of the instrument. 

The ornamental design for a surgical stapling instrument, substantially as shown and described. 